Study on off-state characteristics of polyurethane based magnetorheological gels

2017 2nd International Seminar on Advances in Materials Science and Engineering

Gan, Jianfeng^1 ; He, Xinsheng^1 ; Zhang, Guang^2 ; Zhou, Chongqiu^1 ; Zheng, Qiang^1 ; Gao, Chunfu^1 ; Wang, Hongyun^1

College of Engineering, Zhejiang Normal University, China^1

School of Mechanical Engineering, Nanjing University of Science and Technology, China^2

关键词: Flow charac-teristics;    Linear relationships;    Magneto-rheological;    Mass fraction of irons;    Off state;    Particle content;    Stress increase;    Viscosity increase;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/231/1/012168/pdf
DOI  :  10.1088/1757-899X/231/1/012168

来源: IOP

【 摘 要 】

Magnetorheological gel(MRG) has variable off-state viscosity and it's anti settling performance is very good. Four different ratios of polyurethane based MRGs were prepared (The mass fraction of iron particles was 10%, 25%, 50%, 75%, respectively), and at room temperature (25 ) flow characteristics and viscosity characteristics of off-state of samples was tested. The results indicated that both in the rising and falling stages there is a linear relationship between shear rate and shear stress except shear rate above 110 s-1of MRG-75. The shear stress increases with the increase of particle content. All samples shown obvious shear thinning characteristics, and the viscosity increases with the increase of particle content.